The invention discloses a thermal shrinkage protection device for optical cable plugging. The protection device is characterized in that matched positions at the outer surface of a cylindrical protection pipe barrel are connected with mounting lugs fixedly and symmetrically, wherein each mounting lug is arranged at one end of each of a left handle and a right handle. Intermediate overlap-joint parts of the left handle and the right handle are fastened by pin shafts; and at least one pair of opposite springs is arranged at matched positions along the axial inner side wall of the protection pipebarrel. According to the invention, in order to solve problems in the prior art, the invention aims at providing a thermal shrinkage tube that has advantages of simple and reasonable structure, low cost, great convenience in usage and high safety; a thermal shrinkage protection tube for plugging is installed at the top part of the protection iron tube led by the cable at the transformer substation, so that the damage on the optical cable by the diffusion effect of the heating energy during thermal shrinkage is avoided, the reliability and safety of the ADSS non-metallic cable are improved, and the communication provide good services for the power system.